Oscillating-piston engine.



No. 756,664. PATENTBD APR. 5, 1904.. F. H. LINDNER. OSGILLATING PISTON ENGINE.

APPLICATION FILED JAN. 17 1902.

H0 MODEL. 7 BHBETB-SHEET 1.

n E Q @i" M; l MW ATT JHNEYZE N0- 756,664. PATBNTED APR. 5, 1904. P. H. LINDNBR.

OSGILLATING PISTON ENGINE.

APPLICATION FILED JAN. 17. 1902. no MODEL. 7 SHEETS-SHEET g mus PETERS co. moroumo, wnsuwomu a c No. 756,664. PATENTED APR. 5, 1904.

F. H. LINDNBR. OSGILLATING PISTON ENGINE.

IIIIIIIIIIIII LE D JAN. 17, 1902.

No. 756,664. I PATENTBD APR; 5, 1904. F. H. LINDNBR. OSOILLATING PISTON ENGINE.

APPLIOATI No. 756,664. PATENTED APR. 5, 1904.

F. H. LINDNER. OSGILLATING PISTON ENGINE.

IIIIIIIIIIIIIIIII AN. 17. 1902.

N 0 K 0 D E L 7 S H E E T S S H B E T 5.

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| firs c0 wroumo, WASNINGTDN n c No. 756,664. .PATBNTBD APR. 5, 1904. P. H. LINDNER.

OSGILLATING PISTON ENGINE.

APPLICATION IILED JAN. 17. 1902. '10 MODEL. 1 SHBETSSHEET,6.

ATTI /EY.

No. 756,664. 7 PATENTED APR. 5, 1904.

v E. H. LINDNER. OSGILLATING PISTON ENGINE.-

APPLICATION FILED JAN. 17, 1902.

N0 MODEL. 7 SHEETS-SHEBT 7.

lllllllllilllllllllllll '1 l/ mmlllll ATTOI? Patented April 5, 1904.

PATENT OFFICE.

FRANK H. LINDNER, OF BAYONNE, NEW JERSEY.

OSClLLATlNG-PISTON ENGINE.

SPECIFICATION formingpart of Letters Patent No. 756,664, dated April- 5, 1904.

Application filed January 1'7, 1902- Serial No. 90,205. (No model.)

To all whom it may concern.-

Be it known that I, FRANK H. LINDNER, a citizen of the United States, and a resident of Bayonne, county of Hudson, and State of New Jersey, have invented certain new and useful Improvements in Oscillating-Piston Engines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof, in which similar letters of reference indicate corresponding parts.

My invention relates to a new and improved form of oscillating-piston engine wherein I arrange the oscillating pistons within a casing at points equidistant from a drivingshaft mounted upon and'passing through the casing and connect the said oscillating pistons to the driving-shaft by a particular arrangement of gears mounted upon the shafts of the oscillating and auxiliary shafts and segmental gears mounted upon and securely fastened to the said driving-shaft.

The important feature of my invention is the particular arrangement of the gears and segmental gears operating in conjunction with secondary and auxiliary gears to give the driving-shaft a continuous rotary motion.

A further feature of my invention is the projecting arms, which I shall hereinafter designate as cam-arms and which are formed upon or attached to the gears and segmental gears. These cam projections engage with one another and have an important function in the operation of my engine, as will be hereinafter fully described.

My invention consists, essentially, of the pistons inclosed and oscillating within their respective compartments. hen steam or any suitable expansible fluid is introduced behind the pistons, the said pistons will oscillate and act to give an oscillating motion to the main gear-wheels which are attached to the shafts, which in turn are fastened to and extend outwardly from the said oscillating pistons. These gear-wheels, by means of secondary gear-wheels, in turn give an oscillating motion to a series of gear-wheels which I shall hereinafter designate as auxiliary gearwheels. The main gear-wheels engage consecutively with one of the segmental gears upon the aforesaid driving-shaft and act to rotate the shaft while the pistons move in a direction opposite to the rotation of the said driving-shaft. When the pistons move in the direction corresponding to the direction of the rotation of the driving-shaft, the aforesaid auxiliary g'ear-wheels, operating in conjunction with the said secondary gear-wheels, engage with a second segmental gear, which is securely fastened to the driving-shaft, and act to give the shaft a rotary motion in the same direction as that imparted by the main gears.

The secondary segmental gear hereinbefore mentioned I shall hereinafter designate as the auxiliary segmental gear.

The object of my invention is to provide an engine of the character described wherein I can use the expansive element of the fluid employed .to its fullest extent and give to the driving-shaft a uniform, even, and continuous rotary motion.

A further object is to provide an engine of the character described constructed and operating so that at no time during the rotation of the driving-shaft are all of the pistons in action, two of the pistons always receiving the full impact of the expansible fluid used, giving thereby to the driving-shaft a continuous and even rotary motion.

A further object of my invention is to provide an engine of the nature above described which shall embody compactness and simplicity in construction, economy in cost of manufacture, and other novel features, which will hereinafter be fully described and explained.

In the drawings I have illustrated an engine particulary designed for use as a steamengine, and to facilitate my description I shall confine myself hereinafter to a steam-engine; but it is obvious that by slight modifications I may adapt my engine so that I may use gas or any other suitable fluid.

I attain my objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a top viewof my engine. Fig. 2 is a cross-section taken through the center of the pistons and piston-chambers looking in the dirction indicated by the arrow (12 in Fig.

1. Fig. 3 is a sectional view taken on the line 2 2 of 'Fig. 1 looking in the same direction. Fig. A is a sectional View taken on the line 3 3 of Fig. 1 looking in the same direction. Fig. 5 is a sectional view taken on the line 4 4c of Fig. 1 looking in the same direction. Fig. 6 is a section through the line 1 1 looking in the direction indicated by the arrow X, Fig. 1, and shows the inner flange of the cam-wheel removed. Figs. 7, 8, and 9 are detail views of the valves shown partly in section, and Fig. 10 is a view of the cam-wheel shown partly broken away.

Referring to Figs. 2, 8, t, and 5 of the drawings, A, B, and C designate the oscillating pistons, having projecting vanes and inclosed within the shell or casing S, which is formed with a separate compartment for each piston.

S designates a driven shaft which is rotatably mounted upon and extends through the casing at a point equidistant. from-the center of the pistons A, B, and G.

Within the piston-compartment I form the abutments a, Z), and 0, against which the peripheries of the pistons A, B, and G, respectively, are adapted to engage.

Extending. outwardly from and concentric with the pistons A, B, and C are the shafts a 6 and 0 whose outer ends are mounted in the plate P and to which the main gear-wheels A, B, and C, respectively, are fastened. Each of the said main gear-wheels is adapted to engage consecutively with the segmental gear T, while the pistons move in a direction opposite to the direction of the rotation of the driving-shaft S. The said segmental gearT is securely fastened upon the said drivingshaft. Secondary gear-wheels A B ,.and C are securely fastened upon the shafts a 6 and 0 respectively, near their outer ends and engage with the secondary gear-wheels E, F, and G, which are securely mounted upon the auxiliary shafts e, f, and g, respectively. The auxiliary gear-wheels E, F, and G are also mounted upon the auxiliary shafts f, and g, respectively, and engage consecutively with the auxiliary segmental gear T, while the pistons move in a direction corresponding to the direction of the rotation of the driven shaft to which the auxiliary segmental gear is attached.

The abutments a, b, and c are provided with two openings or ports each, 1 and 2, 1 and 2 and 1 and 2, respectively, which open into the piston-chambers on each side of the abutments.

The'piston chambers are connected, by means of pipes and valves, to the source of steam-supply andexhaust-operiings in the following order: The ports 1 and 2*, leading into the chambers of the piston A, are connected to the valve-boxes 1 and 2, respectively, by means of the connecting-pipes 3 and 49. The ports 1 and '2 leading into the chambers of the piston B, are connected to the valve-boxes 1 and 2 respectively, by means of the connecting-pipes 3 and 4: and the ports 1 and 2, leading into the chambers of the piston C,

are connected to the valve-boxes 1 and 2 respectively, by means of the connecting-pipes 3 and 4E".

The admission and exhaust of the steam into and out of the chambers of the piston-compartments are governed by means of the rotary valves V, Figs. 7 8, and 9, having a passage or'cut-out portion 0 and .inclosed within each of the valve-boxes.

The pipes 9, 9 and 9 are steam-supply pipes, which will when connected, by means time to admit and exhaust steam into and out of the piston-chambers by means of cams formed upon the flanges W and Wv upon the cam-wheel W, which are adapted to engage with the roller ends of the projecting arms securely fastened to the ends of the shafts of the rotary valves V. The valves within the valve-boxes 2 2 and 2 are provided with the short shafts e c and if, respectively, to the ends of which are fastened projecting arms integrally connected and provided with roller ends adapted to engage with the cam formations upon the flanges of the cam-wheel W. The projecting arms upon the shafts e Q1 and o are provided with the rollers r, W and r Thevalves operating within the valve-boxes 1, 1 and 1 are provided with the long shafts 1 T, and 3 respectively, to the ends of which are fastened projecting arms integrally connected, which have mounted upon them the rollers 1 2 3 and 1 similar to those of the projecting arms of the short shafts and adapted to engage with the cam projections upon the flanges of the cam-wheel W to operate the valves. Cam projections w, w, 012 and 10 are formed upon the flange W of the cam-wheel, and the cam projections 1", 2, 3', and 1 are formed upon the flange W andin Fig. 3 I have shown the relative position of the last-mentioned cam projection by dotted lines. The cam projections are adapted to engage with the rollers at the proper time to operate the valves, as will be hereinafter described.

The steam-supply pipes 9 9 and 9 are connected to and lead from one main supply-pipe, which may be provided with a suitable valve and controlled by any approved governor attachment, and the exhaust-pipes 0 may all lead into one general exhaust-pipe to carry off the exhaust-steam.

Referring again to the gear-wheel mechanism, t designates a cam-arm formed upon the segmental gear T and adapted to engage consecutively with the cam-arms 1, 1 and 1, formed upon each of the main gear-wheels A, B, and C, respectively, just before the teeth of the said segmental gear are about to engage with the teeth of each main gear-wheel and be fore steam is allowed to enter the piston-chamber to drive the piston. Upon the auxiliary segmental gear T, I form a similar cam-arm 6 which is adapted to engage with the cam-arms 1", l and 1 formed upon each of the auxiliary gears E, F, and G, respectively, just before the teeth of the said auxiliary segmen tal gear T are about to engage with the teeth of each auxiliary gear-wheel and before steam is allowed to enter the piston-chamber to drive the piston in the opposite direction. The segmental gear T is further provided with a second cam-arm 25 which engages consecutively with the cam-arms 2 2, and 2 formed upon the main gear-wheels A, B, and C, respectively, just before the teeth of the said segmental gear T disengage the teeth of each of the said main gear-wheels and act to continue the movement of each piston until its vane reaches the abutment. The auxiliary segmental gear is also provided with a second cam-arm f, similar to the cam-arm 25 which is adapted to engage consecutively with the cam-arms 2 2 and 2*", formed uponthe auxiliary gear-wheels E, F, and G, respectively, just before the teeth of the auxiliary segmental gear T disengage the teeth of the said auxiliary gear-wheels and act to continue the movement of each piston in the opposite direction until its vane reaches the abutment.

The filled-in sections P and P in Fig. 2 denote chambers containing live or active steam.

In practice my device operates as follows: Referring to Fig. 2, I will assume that the engine is in full operation and that the main shaft S is rotating in the direction indicated by the arrow The pistons A and B will then be moving in the direction indicated by the arrows X and X*, respectively, while the piston C is stationary. Steam is entering the chamber of the piston A through the inlet 2, while the exhaust is being driven out through the port 1. In the chamber of the piston B the steam has been cut off by the action of the cam '10, which has just passed and engaged the roller 2" of the shaft 2" and turned the valve V in the valve-box 1 thereby closing the inlet-port 1. The port 2 of the piston C has just been opened by the action of the cam 2 upon the roller 1' of the shaft 0* and has become an exhaust-port, while the port 1 will be opened by the cam 49' engaging the roller 4:. Steam will then enter through the port 1 and act to drive the shaft in the direction indicated by the arrow X; but by this time the piston A will have moved until its vane has assumed a position about diametrically opposite to the abutment a, when the cam 1 engaging with the roller 0' will act to cut off the steam through the port 2* and allow the expansion of the steam to further move the piston. By the time the steam has been cut off from the port 2 of the piston A the piston B will have traveled to the point Where the cam-arm t of the segmental gear T engages with the cam-arm 2" of the main gearwheel B and drive the said piston the remaining distance or until its vane reaches the abutment. The relative position of the cam-arms 23 and 2 at this point will correspond to the relative position of the cam-arms 25 and 2*. (Best shown in Fig. l.) The piston B in this position remains stationary until the cam-arm t of the segmental gear T engages with the cam-arm 1 of the auxiliary gear F, when it will begin to move in a direction opposite to the direction indicated by the arrow X and steam will be admitted through the port 2 by the action of the cam 2 engaging the roller 1' upon the shaft 71 in a manner similar to the action of the cam 2 upon the roller r attached to the shaft 01*. The action in connection with all of the pistons and their gears is similar and occurs consecutively, and it will be seen that two of the pistons are at all times receiving the full action of the expansive steam. The port 1 becomes an inletport shortly after the vane of the piston A has reached the abutment a by the action of the cam i engaging with the roller 4 of the shaft 3 after the cam 8' has engaged with the roller 3" to close the exhaust-port, and the port 2 will then become an, exhaust-port by the action of the cam 2 engaging with the roller r of the shaft 1 after the cam 1 has cut ofif the steam by engaging with the roller When the piston B has completed its movement, the port 1 becomes an exhaust-port by the action of the cam 20 upon the roller 1 of the shaft 2 after the cam w has acted upon the roller 2 to close the port and the port 2 becomes an inlet-port through the action of the cam 10 upon the roller 1 of the shaft '0 after the cam 20 has engaged with the roller 1" to close the port 2 When the piston C has made its complete movement, the port 1 will become an exhaust-port by the action of the cam Q02 engaging with the roller 1 of the shaft 3 after the cam to has engaged with the roller 2 to cut off the steam. The port 1 is closed at the proper time by the action of the cam 3 engaging the roller 3 of the shaft 3. The action of the cam and roller ends formed upon the various shafts is consecutive and similar for each complete oscillation of the-pistons. The various cams all come into active operation with the proper roller ends at the proper time of each piston during each revolution of During the operation the driving-shaft S.

of the engine the main gear-wheels A, B, and C engage consecutively with the segmen-' tal gear T and act to drive the shaft in the direction indicated by the arrow X while the pistons move in an opposite direction. When the pistons move in the direction corresponding to the direction of the rotation of the shaft, the auxiliary gear-wheels operated by the secondary gear-wheels are adapted to engage con- Secutively with the auxiliary segmental gear, giving to the shaft the same rotary motion which is imparted to it by the main gear-wheel. While the main gear-wheel of the piston is engagingwith the segmental gear, its adjacent auxiliary gear does not engage with the auxiliary segmental gear, and while the auxiliary gear is engaging with the auxiliary segmental gear the main gear-wheels are not engaging with the segmental gear. The cam-arms are provided to insure a positive action to the engaging gears, as Well as to act as a guide for I same and take away the strain from the teeth of the gears of the first impact. The cams all engage in a consecutive order, and all the parts work together to give a continuous, even, and steady rotation to the driving-shaft.

It is obvious that I may employ upon my engine any of the approved governing devices for regulating the speed.

Various forms or methods of controlling the admission of steam into the chambers may be used in my device. I do not, therefore, wish to limit myself to the particular valve-controlling mechanism shown.

As hereinbefore stated, the engine illustrated in the drawings is particularly designed for use as a steam-engine; but it is obvious that by slight modifications my engine may be adapted sothat numerous expansible fluids may be used and the same operative result obtained, and I might also by adding the proper controlling mechanism adapt my engine to be used as an ignitible-gas engine.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an engine, a shaft to be rotated, a plurality of piston-chambers grouped about said shaft, oscillating pistons in the .respective chambers, translating and commuting gearing between said pistons and shaft for converting the oscillating movements of the pistons into 7 continuous rotary motion of the driven shaft sion of fluid successively to the said pistons and its exhaust, substantially as described.

3. In an engine, a shaft to be rotated, a plurality of piston-chambers grouped about said shaft, oscillating pistons in the respective chambers, translating and commuting gearing between said pistons and shaft for converting the movements of the pistons into continuous rotary motion of the shaft, and automatic valve mechanism controlling the admission of fluid successively to said pistons, its cut off for use expansively, and its exhaust, substantially as described.

t. In an engine, a shaft to be rotated, three piston-chambers grouped concentrically about said shaft, oscillating pistons in the respective chambers, translating and commuting gearing between said pistons and the driven shaft for converting the oscillatory movements of the pistons into continuous rotary motion of the shafts, and automatic valve mechanism controlling the admission of fluid successively to said pistons, its cut off for use expansively, and its exhaust, substantially as described.

5. In an engine, a shaft to be rotated, a plurality of piston-chambers grouped adjacent to said shaft, oscillating pistons in the respective chambers, translating and commuting gearing between the respective pistons and said shaft, and valve mechanism actuated by said shaft and controlling the admission of fluid to, and its exhaust from said chambers, substantially as described.

6. In an engine, a shaft to be rotated, pistons adapted to oscillate in suitable chambers and grouped adjacent to the said shaft, means for admitting a fluid under tension to the piston-chambers successively and exhausting it at proper times, and translating and commuting gearing between said pistons and shaft whereby the oscillating movements of the pistons is converted into continuous rotary motion of the shaft, substantially as described.

7 In an engine, a shaft to be rotated, pistons adapted to oscillate in chambers grouped aboutsaid shaft, the oscillating axes of the pistons being concentric and parallel with said shaft, automatic valve mechanism for admitting fluid to said pistons successively and for operating the exhaust therefrom,whereby the pistons shall be, at any given time, at different points in their strokes, and translating and commuting gearing between said pistons and shaft for converting the oscillating movements of the pistons into continuous rotary motion of the shaft,substantially as described.

8. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston chambers, gear wheels securely fastened to the shafts of the said oscillating pistons, a central shaft, mounted upon and passing through the said casing and a segmental gear securely fastened to the said cen- ICC tral shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the said pistons; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, substantially as described.

9. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears upon being adapted to engage with the duplicate gears upon the said piston-shafts, a central shaft mounted upon and passing through the said casing and a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts; the said auxiliary gear-wheels being adapted to engage with the said segmental gear while the piston moves in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, substantially as described.

10. In an engine, acasing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts; the duplicate gears upon the auxiliary shafts being adapted to engage with the duplicate gears upon the said piston-shafts, acentral shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons and an auxiliary segmental gear also secured to the said central shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts; the said segmental gear being revolved by means of the said auxiliary gearwheels mounted upon the auxiliary shaft while the piston moves in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, substantially as described.

11. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shaft of the said oscillating pistons, cam projections formed upon the said mental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gear-wheels mounted upon the said shafts of the pistons, and cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, substantially as described.

12. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston chambers, gearwheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with the duplicate gears upon the aforesaid piston-shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gear-Wheels fastened to the said auxiliary shafts, and cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gears; the said auxiliary gear-wheels being adapted to engage with the said segmental gear while the pistons move in a direction corresponding to the direction of the rotation of the segmental gear and central shaft, substantially as described.

18. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons cam projections formed upon the said gear-wheels, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels, an auxiliary segmental gear also securely fastened to the said central shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts, and cam projections formed upon the said auxiliary segmental gear and adapted to engage with the cam. projections formed upon the said auxiliary gears; the aforesaid duplicate gears upon the pistonshafts being adapted to engage with the duplicate gears of the aforesaid auxiliary shafts and the aforesaid gear-wheels being adapted to engage with the aforesaid segmental gear to revolve the aforesaid central shaft when the pistons to which they are connected move in the direction opposite to the direction of the rotation of the said segmental gear and central shaft, and the auxiliary gear-wheels being adapted to engage with the said auxiliary segmental gear to revolve the central shaft While the pistons are moving in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, substantially as described.

M. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gear- Wheels mounted upon the shafts of said pistons; the said gear-wheels being adapted to engage with the said segmental gear While the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the, casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contacting arms having roller ends, secured to the said rotary valves and a cam-wheel mounted upon and rotating with the aforesaid central shaft and provided With cam projections which are adapted to engage with the roller ends of the said contacting arms to open and close the inlet and exhaust ports leading to and from the pistonchambers, substantially as described.

15. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate Within the said piston chambers, gear Wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the shafts of said pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with duplicate gears upon the said piston-shafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts; the said auxiliary gearwheels being adapted to engage with the segmental gear while the piston moves in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contacting arms having roller ends, secured to the said rotary valves, and a cam-wheel mounted upon and rotatin g with the aforesaid central sh aft and provided with cam projections which are adapted to engage with the roller ends of the said contacting arms to open and close the inlet and exhaust ports leading to and from the piston chambers, substantially as described.

16. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston chambers, gear wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the auxiliary shafts; the duplicate gears upon the auxiliary shaft being adaptedto engage with the duplicate gears upon the piston-shafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said central shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons, an auxiliary segmental gear also secured to the said central shaft and adapted to engage with the aforesaid auxiliary gearwheels mounted upon the aforesaid pistonshafts while the pistons move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, and the said auxiliary segmental gear being revolved by means of the said auxiliary gear-wheels mounted upon the auxiliary shafts while the piston moves in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contacting arms having roller ends secured to the said rotary valve and a cam-wheel mounted upon and rotating with the aforesaid central shaft and provided with cam projections which are adapted to engage with the roller ends of the said contacting arms to open and close the inlet and exhaust ports leading to and from the piston-chambers,substantially as described.

17. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear-wheels, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gearwheels mounted upon the said shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid ahutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contacting arms having roller ends secured to the said rotary valves, and a camwheel mounted upon and rotating with the aforesaid central shaft and provided with cam projections which are adapted to engage in the roller ends ofthe said contacting arms to open and close the inlet and exhaust ports leading to and from the piston-chambers, substantially as described. 7

18. In an engine, acasing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the said shafts of the oscillating pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with the duplicate gears upon the aforesaid pistonshafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gearwheels fastened to the said auxiliary shafts, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gears; the said auxiliary gear-wheels being adapted to engage with the said segmental gear while the pistons move in a direction corresponding to the direction of the rotation of the segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contact-arms having roller ends, secured to the said rotary valve, and a cam-wheel mounted upon and rotating with the aforesaid central shaft and provided with cam projections which are adapted to engage with the roller ends of the said contacting arms to open and close the inlet and exhaust ports leading to and from the piston-chambers, substantially as described.

19. In an engine, a casing with pistonchambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear wheels, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear fastened to the said shaft and adapted to engage with the aforesaid gearwheels mounted upon the shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels, an auxiliary segmental gear also securely fastened to the said central shaft and adapted to engage with the aforesaid auxiliary gear wheels mounted upon the auxiliary shafts, cam projections formed upon the said auxiliary segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gear-wh eels; the aforesaid duplicate gears upon the piston-shafts being adapted to engage with the duplicate gears of the aforesaid auxiliary shafts and the aforesaid gearwheels upon the piston-shafts being adapted to engage with the aforesaid segmental gear to revolve the aforesaid central shaft when the pistons to which they are connected move in a direction opposite to the direction of the rotation of the segmental gear and central shaft, and the auxiliary gear wheels being adapted to engage with the auxiliary segmental gear to revolve the central shaft while the pistons are moving in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, contacting arms having roller ends, secured to the said rotary valves, and a cam-wheel v mounted upon and rotating with the aforesaid central shaft and provided with cam projections which are adapted to engage with the roller ends of the said contacting arms to open and close the inlet and exhaust ports leading to and from the piston-chambers, substantially as described.

20. In an engine, acasing with piston-chamhers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gearwheels mounted upon the shafts of the said pistons; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports and suitable means for operating the said valves, substantially as described.

21. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the shafts of the said pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said'duplicate gears being adapted to engage with duplicate gears upon the said piston-shafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shaft; the said auxiliary gearwheels being adapted to engage with a segmental gear While the piston moves in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-cham' bers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, and suitable means for operating the said valves, substantially as described.

22. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons'adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary duplicate gears mounted upon the said auxiliary shafts; the duplicate gears upon the auxiliary shafts being adapted to engage with the duplicate gears upon the piston-shafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to said central shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons, and an auxiliary segmental gear also securely fastened to said central shaft and adapted to engage with the aforesaid auxiliary gear-Wheels mounted upon the aforesaid piston-shafts while the pistons move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, the said auxiliary segmental gear being revolved by means of the said auxiliary gear-wheels mounted upon the auxiliary shafts while the piston moves in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, and suitable means for operating the said valves, substantially as described.

23. In an engine, acasing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear-wheels, acentral shaft mounted upon and passing through said casing, asegmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gearwheels mounted upon the said shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, and suitable means for operating the said valves, substantially as described.

24. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the piston chambers, gear wheels securely fastened to the shafts of the said oscillating pistons, duplicate gears securely'fastened upon the said shafts of the oscillating pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears upon the auxiliary shafts being adapted to engage with the duplicate gears upon the aforesaid piston-shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shafts and adapted to engage with the aforesaid auxiliary gear-wheels fastened to the said auxiliary shafts, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gear-wheels; the said auxiliary gear-Wheels being adapted to engage with the said segmental gear while the pistons move in a direction corresponding to the direction of the rotation of the segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, and suitable means for operating the said valves, substantially as described.

25. In an engine, a casing with piston-cham bers having abutments formed therein and oscillating pistons, cam projections formed upon the said gear-wheels securely fastened to the shafts of'the said oscillating pistons, and cam projections formed upon the said gear-wheels, duplicate gears securely fastened upon said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear fastened to the said shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections, formed upon the aforesaid gear-wheels, an auxiliary segmental gear also securely fastened to the said central shaft and adapted to engage with the aforesaid auxiliary gear wheels mounted upon the auxiliary shafts, cam projections formed upon the said auxiliary segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gear-wheels; the aforesaid duplicate gears upon the piston-shafts being adapted to engage with the duplicate gears of the aforesaid auxiliary shafts and the aforesaid gear-wheels upon the piston-shafts being adapted to engage with the aforesaid segmental gear to revolve the aforesaid central shaft when the pistons to which they are connected move in a direction opposite to the direction of the rotation of the segmental gear and central shaft,

and the auxiliary gear-wheels being adapted to engage with the auxiliary segmental gear to revolve the central shaft while the pistons are moving in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, and suitable means for operating the said valves, substantially as described.

26. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gearwheels mounted upon the shafts of the said pistons; the said gearwheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

27. In an engine, acasing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-Wheels securely fastened to the shaft of the said oscillating pistons, duplicate gears securely fastened upon the shafts of the said pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts, the said duplicate gears being adapted to engage with duplicate gears upon the said piston-shafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts; the said auxiliary gear-Wheels being adapted to engage with the segmental gear while the piston moves in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission'and exhaust of the expansible fluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

28. In an engine, acasing with piston-cham bers having abutments formed therein, oscillating pistons adapted to oscillate Within the said piston chambers, gear wheels securely the aforesaid gear-wheels mounted upon the shafts of the pistons, an auxiliary segmental gear also secured to the central shaft and adapted to engage with the aforesaid auxiliary gearwheels mounted upon the aforesaid pistonshafts, while the pistons move in the direction opposite to the direction of the rotation of the said segmental gear and central shaft, and the said auxiliary segmental gear being revolved by means of the said auxiliary gear-wheel mounted upon the auxiliary shaft while the piston moves in the direction corresponding to the direction of the rotation of the central shaft and segmental gear, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansiblefluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time, and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

29. In an engine, acasing and piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate Within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear-wheels, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adaptedto engage with the aforesaid gear- Wheels mounted uponthe said shafts of the pistons, cam projections formed upon the said segmentalgear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels; the said gear-wheelsbeing adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of the expansible fluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time, and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

30. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate Within the said piston chambers, gearwheels securely fastened to the shafts of said oscillating pistons, duplicate gears suitably fastened upon the shafts of the said oscillating pistons, auxiliary shafts mounted upon the casing, auxiliary duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with the duplicate gears upon the aforesaid piston-shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid auxiliary gearwheels fastened to the auxiliary shafts, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gears; the said auxiliary gears being adapted to engage with the said segmental gear while thepistons move in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaustof the expansible fluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time, and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

31. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston chambers, gear wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear-wheels, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts, cam projections formedupon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear fastened to the said shaft and adapted to engage the aforesaid gear-wheels mounted upon the shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gearwheels, an auxiliary segmental gear also securely fastened to the said central shaft and adapted to engage with the aforesaid auxiliary gear wheels mounted upon the auxiliary shafts, cam projections formed upon the said auxiliary segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gear-wheels; the aforesaid duplicate gears upon the piston-shafts being adapted to engage with the duplicate gears of the aforesaid auxiliary shafts and the aforesaid gearwheels upon the piston-shafts being adapted to engage with the aforesaid segmental gear to revolve the aforesaid central shaft when the pistons to which they are connected move in a direction opposite to the direction of the rotation of the segmental gear and central shaft, and the auxiliary gear-wheels being adapted to engage in the auxiliary segmental gear to revolve the central shaft while the pistons are moving in a direction corresponding to the direction of the rotation of the said central shaft and segmental gears, inlet and exhaust ports formed in the aforesaid abutments in the piston-chambers, rotary valves mounted upon the casing and suitably connected to the said inlet and exhaust ports and adapted to control the admission and exhaust of expansible fluid through the said ports, suitable operating mechanism for opening and closing the ports at the proper time, and suitable means for governing the admission of the expansible fluid to regulate the speed of the engine, substantially as described.

32. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage with the aforesaid gearwheels mounted upon the shafts of the said pistons; the said wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction opposite to the direction of the rotation of the said segmental gear and central shaft, and suitable packing for the said oscillating pistons, substantially as described.

33. In an engine, a casing with piston-chambers having abutments formed therein, an oscillating piston adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons,duplicate gears securely fastened upon the said shafts and the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with the duplicate gears upon the said piston-shafts, a central shaft mounted upon and passing through the said casing, and a segmental gear secured to the said shaft and adapted to engage in the aforesaid auxiliary gear-wheels mounted upon the said auxiliary shafts, the said auxiliary gearwheels being adapted to engage with the said segmental gear while the piston moves in a direction corresponding to the direction of the rotation of the said segmental gear and central shaft, and suitable packing for said oscillating pistons, substantially as described.

34. In an engine, acasing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said pistonchambers, gear wheels securely fastened to the shafts of the said oscillating pistons,duplicate gears securely fastened upon the said shafts of the oscillating pistons, aux iliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts; the duplicate gears upon the auxiliary shafts being adapted to engage with the duplicate gears upon the said pistonshafts, a central shaft mounted upon and passing through the said casing, a segmental gear secured to the said shaft and adapted to engage with the aforesaid gear-wheels mounted upon the shafts of the pistons, an auxiliary segmental gear also secured to the said central shaft and adapted to engage with the afore said auxiliary gear-Wheels mounted upon the said auxiliary shafts; the said segmental gear being revolved by means of the aforesaid segmental gear-wheels mounted upon the aforesaid piston-shafts while the piston moves in the direction opposite to the direction of the rotation of the said segmental gear and shaft, and the said auxiliary segmental gear being revolved by means of the said auxiliary gear- Wheel mounted upon the auxiliary shaft while the piston moves in the direction corres ponding to the direction of the rotation of the said central shaft and segmental gears, and suitable packing for the said oscillating pistons, substantially as described.

35. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the shafts of the said oscillating pistons, cam projections formed upon the said gear-wheels, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened to the said central shaft and adapted to engage in the aforesaid gear-wheels mounted upon the said shafts of the pistons, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the aforesaid gear-wheels; the said gear-wheels being adapted to engage with the said segmental gear while the pistons to which they are attached move in a direction oppositeto the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears securely fastened upon the said auxiliary shafts; the said duplicate gears being adapted to engage with the duplicate gears upon the aforesaid piston-shafts, cam projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the casing, a segmental gear secured to the said shaft and adapted to engage in the aforesaid auxiliary gear-wheels and fastened to the said auxiliary shafts, cam projections formed upon the said segmental gear and adapted to engage with the cam projections formed upon the said auxiliary gears; the said auxiliary gear-wheels being adapted to engage With the said segmental gear while the pistons move in a direction corresponding to the direction of the rotation of the segmental gear and central shaft, and suitable packing for the said oscillating pistons, substantially as described.

37. In an engine, a casing with piston-chambers having abutments formed therein, oscillating pistons adapted to oscillate within the said piston-chambers, gear-wheels securely fastened to the said oscillating pistons, cam projections formed upon the said gear-wheels, duplicate gears securely fastened upon the said shafts of the pistons, auxiliary shafts mounted upon the casing, auxiliary and duplicate gears mounted upon the said auxiliary shafts, cam

projections formed upon the said auxiliary gears, a central shaft mounted upon and passing through the said casing, a segmental gear securely fastened tothe said shafts and adapted to engage with the aforesaid gear-Wheels mounted upon the shafts of the pistons, cam projections formed upon the said segmental gears and adapted to engage with the cam projections formed upon the aforesaid gear- Wheels, an auxiliary segmental gear also securely fastened to the said central shaft and adapted to engage with the aforesaidauxiliary gear-Wheels mounted upon the said auxiliary shafts, cam projections formed upon the said auxiliary segmental gears and adapted to engage with the cam projections formed upon the said auxiliary gears; the aforesaid duplicate gears upon the piston-shafts being adapted to engage with the duplicate gears of the aforesaid auxiliary shafts and the aforesaid gear-wheels being adapted to engage with the aforesaid segmental gear to revolve the central shaft when the pistons to which they are connected move in the direction opposite to the direction of the rotation of the said segmental gear and central shaft, and the auxiliary gear-wheels being adapted to engage with the said auxiliary segmental gear to revolve the central shaft while the pistons are moving in a direction corresponding to the direction of the rotation of the central shaft and segmental gears, and suitable packing for the said oscillating pistons, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses,this 1st day of July, 1901.

Witnesses:

S. S. SUGAR, B..McCoMB. 

